Fluid cylinder



FIG. 1 is a side perspective view of a fluid cylinder showing our newdesign;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a front elevational view thereof; and,

FIG. 5 is a rear elevational view thereof.

The ornamental design for a “fluid cylinder”, as shown and described.